Issue 24

Andrey E. Buzyurkin et alii, Frattura ed Integrità Strutturale, 24 (2013) 102-111 ; DOI: 10.3221/IGF-ESIS.24.11 108 these graphs shows that, in the axisymmetric case, due to the wave divergence to the axis, the pores undergo collapsing in a larger volume than in the planar variant. X, cm Y, cm 0.5 1 1.5 X, cm Y, cm 2 0.5 1 1.5 а) b) 8 6 4 2 8 6 4 Y, cm 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0.2 0.1 porosity Figure 9 : Density isolines for = 0.5 e  cm: а) cylindrical configuration; b) planar statement. Figure 10 : Porosity 1 m for = 0.5 e  cm: solid line is planar statement; dashed line is cylindrical configuration. A twofold increase in the explosive thickness makes the decay of the incidence shock wave less intensive. The density isolines for the explosive thickness =1 e  cm and the external pressure = 0.05 P Mbar are shown in Fig. 11, a and b. Parts a and b of this figure shows the calculation data for the axisymmetric and planar statements, respectively. It is clearly seen that in the case of cylindrical symmetry the shock wave bends near the axis, giving rise to an irregular reflection; in the planar configuration, a regular interaction occurs. Fig. 12, which depicts the distribution of porosity 1 m across the sample compacted in the cylindrical geometry (the dashed line in Fig. 12), is indicative of complete collapsing of pores over the entire thickness of the sample. In the planar case (see the dashed line in Fig. 12), the complete collapsing of pores is observed approximately over half the thickness of the sample, and the porosity near the symmetry axis is close to the initial one, 0 1 m . X, cm Y, cm 0.5 1 1.5 X, cm Y, cm 2 0.5 1 1.5 а) b) 8 6 4 2 8 6 4 Y, cm 0.2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0.1 0 porosity Figure 11 : Density isolines for = 1 e  cm: a) cylindrical configuration; b) planar configuration. Figure 12 : Porosity 1 m for = 1 e  cm: solid line - planar statement; dashed line - cylindrical configuration. The density isolines for the explosive thickness = 2 e  cm are shown in Fig. 13, a and b. The external pressure was taken to be = 0.05 P Mbar. Parts a and b of this figure show the calculation data for the axisymmetric and planar statements. In the cylindrical case (see Fig. 13, a), an irregular reflection is clearly observed, whereas in the planar case (see Fig. 13, b) the